Bioconversion of industrial hemp biomass for bioethanol production: A review

Zhao, Jikai; Xu, Youjie; Wang, Weiqun; Griffin, Jason; Roozeboom, Kriag; Wang, Donghai

doi:10.1016/j.fuel.2020.118725

Cited by 95 publications

(91 citation statements)

References 111 publications

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“…During pretreatment, the efficient solubilization and elimination of hemicellulose, lignin, and extractives resulted in the increase in glucan content in pretreated biomass. 6 High glucan in pretreated hemp biomass would be beneficial for subsequent ethanol concentration. 5 These results also indicate that alkali pretreatment functioned to cleave chemical bonds (ester and ether bonds) between lignin and hemicellulose, thus reducing the recalcitrance of lignocellulosic biomass for sealing cellulose.…”

Section: Results and Discussionmentioning

confidence: 99%

“…For example, large amounts of studies have reported high sugar and ethanol yields under low solid loading to elucidate and promote the function of pretreatment, whereas the low ethanol concentrations were neglected. 6 Rapid reduction in sugar-to-ethanol conversion rates with the increase in solid loading (6–12% solids: 95.1–88.4; 15–21% solids: 86.9–67.6%) might be related to (1) the accumulated inhibitors (cellobiose and ethanol) limiting enzymatic and microbial activities; (2) lower water available slowing down mass transfer; and (3) hydrophobic interaction between residual lignin and cellulase reducing enzymatic absorption. 4 Similarly, Lu et al 29 conducted enzymatic hydrolysis of steam-exploded corn stover with the solid loading ranging from 10 to 30% and found that sugar yields decreased from 75.6 to 72.1% but glucose concentration increased from 35.9 to 103.3 g/L.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Also, dilute alkali pretreatment can neutralize the released acids (such as acetic acid) and solubilize the disrupted lignin matrix. 6 In our previous studies, dilute NaOH pretreatment achieved high lignin removal and sugar and ethanol yields. 12 …”

Section: Introductionmentioning

confidence: 90%

“…However, a general phenomenon was observed that a random selection of high solid loading for SSF was performed to boost ethanol concentration without statistical reasons. 6 , 15 , 22 , 23 Therefore, avoiding the selection of the solid loading for enzymatic hydrolysis and fermentation groundlessly is required.…”

Section: Introductionmentioning

confidence: 99%

“…To our knowledge, there are no studies conducted using industrial hemp biomass with high solid loading (more than 10%) to boost bioethanol concentration. 6 In this study, industrial hemp (Tygra variety) biomass pretreated with dilute NaOH was used for SSF. The relationship between ethanol yield/concentration and solid loading (6–21%) in four scenarios, including Case I: 30 filter paper unit (FPU)-cellulase and 140 fungal xylanase unit (FXU)-hemicellulase/g-solid; Case II: 40 FPU-cellulase and 140 FXU-hemicellulase/g-solid; Case III: 30 FPU-cellulase and 140 FXU-hemicellulase/g-solid with 1% Tween 80; and Case IV: 30 FPU-cellulase and 140 FXU-hemicellulase/g-solid with particle size reduction (<0.2 mm), was evaluated and simulated.…”

Section: Introductionmentioning

confidence: 99%

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High Ethanol Concentration (77 g/L) of Industrial Hemp Biomass Achieved Through Optimizing the Relationship between Ethanol Yield/Concentration and Solid Loading

Zhao

Wang

et al. 2020

ACS Omega

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In this study, the relationships between ethanol yield/concentration and solid loading (6–21%) were investigated to enhance ethanol titer and avoid a random choice of solid loading for simultaneous saccharification and fermentation (SSF). Alkali-pretreated hemp biomass was used for SSF in four scenarios including Case I: 30 filter paper unit (FPU)-cellulase and 140 fungal xylanase unit (FXU)-hemicellulase/g-solid; Case II: 40 FPU-cellulase and 140 FXU-hemicellulase/g-solid; Case III: 30 FPU-cellulase and 140 FXU-hemicellulase/g-solid with 1% Tween80; and Case IV: 30 FPU-cellulase and 140 FXU-hemicellulase/g-solid with particle size reduction (<0.2 mm). Results showed that bioethanol yield and concentration had a negative linear ( R 2 = 0.76–0.93) and quadratic ( R 2 = 0.96–0.99) correlation with solid loading (6–21%), respectively. As compared to Case I and previous studies, an enhancement in ethanol yield and concentration through increasing cellulase dose (Case II) and adding Tween 80 (Case III) was overestimated, whereas particle size reduction (Case IV) extended the “solid effect”, evidenced by the highest ethanol concentration (77 g/L) achieved from SSF at the focus point of a quadratic model. An interpretation of the relationship between ethanol yield/concentration and solid loading not only avoids a blind selection of solid loading for SSF but also reduces extra enzymes and water consumption.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High Ethanol Concentration (77 g/L) of Industrial Hemp Biomass Achieved Through Optimizing the Relationship between Ethanol Yield/Concentration and Solid Loading

Zhao

Wang

et al. 2020

ACS Omega

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An insight into microbial sources, classification, and industrial applications of xylanases: A rapid review

Kaur

Joshi

Sharma

et al. 2023

Biotech and App Biochem

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Endo 1,4‐β‐d‐xylanases (EC3.2.1.8) are one of the key lignocellulose hydrolyzing enzymes. Xylan, which is present in copious amounts on earth, forms the primary substrate of endo‐xylanases, which can unchain the constituent monosaccharides linked via β‐1,4‐glycosidic bonds from the xylan backbone. Researchers have shown keen interest in the xylanases belonging to glycoside hydrolase families 10 and 11, whereas those placed in other glycoside hydrolase families are yet to be investigated. Various microbes such as bacteria and fungi harbor these enzymes for the metabolism of their lignocellulose fibers. These microbes can be used as miniature biofactories of xylanase enzymes for a plethora of environmentally benign applications in pulp and paper industry, biofuel production, and for improving the quality of food in bread baking and fruit juice industry. This review highlights the potential of microbes in production of xylanase for industrial biotechnology.

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Catalytic Steam Reforming of Ethanol to Produce Hydrogen: Modern and Efficient Catalyst Modification Strategies

El‐Salamony

2023

ChemistrySelect

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Hydrogen is regarded as one of the most promising renewable energy that carriers with a high heating value for replacing fossil fuels and meeting clean energy requirements. Steam reforming has shown considerable promises in the creation of hydrogen. Many studies on catalytic steam reforming of ethanol have been published. Hence, developing efficient and stable catalysts capable of producing large H2 yields and ethanol conversion is a crucial step. Nickel is an essential industrial catalyst because it enhances hydrogenation and dehydrogenation reactions by promoting the scission of C−C bonds. Many studies have been conducted by employing noble metal‐based catalysts to reduce coke deposition and enhance metal stability against sintering since they are known to successfully break the C−C bond, resulting in less carbonaceous deposits and hence more stable catalysts. To avoid carbon production, alkaline promoters, and bimetallic heterogeneous catalysts are commonly utilized in catalysis. However, because huge amounts of by‐product CO2 produced by SRE courses are usually regarded as the primary cause of hydrogen purity degradation, it is recommended to remove CO2 in‐situ to achieve high hydrogen production.

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Bioconversion of industrial hemp biomass for bioethanol production: A review

Cited by 95 publications

References 111 publications

High Ethanol Concentration (77 g/L) of Industrial Hemp Biomass Achieved Through Optimizing the Relationship between Ethanol Yield/Concentration and Solid Loading

High Ethanol Concentration (77 g/L) of Industrial Hemp Biomass Achieved Through Optimizing the Relationship between Ethanol Yield/Concentration and Solid Loading

An insight into microbial sources, classification, and industrial applications of xylanases: A rapid review

Catalytic Steam Reforming of Ethanol to Produce Hydrogen: Modern and Efficient Catalyst Modification Strategies

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